diff --git a/sql/sql_sort.h b/sql/sql_sort.h
index 430f313631f..2c01b01b607 100644
--- a/sql/sql_sort.h
+++ b/sql/sql_sort.h
@@ -300,7 +300,7 @@ public:
 
   Sort_param()
   {
-    memset(this, 0, sizeof(*this));
+    memset(reinterpret_cast<void*>(this), 0, sizeof(*this));
   }
   void init_for_filesort(uint sortlen, TABLE *table,
                          ha_rows maxrows, bool sort_positions);